Apparatus for raising and leveling forms for walls of concrete structures



J. M. JACK ETAL APPARATUS FOR RAISING AND LEVELING FORMS May 13, 1952 FOR WALLS OF CONCRETE STRUCTURES 4 Sheets-Sheet 1 Filed Nov. '7, 1949 SnventorS d M n Z e m5 JMJ M. a 0

Bb, V Wanttornegs May 13, 1952 J. M. JACK ET AL 2,596,854

APPARATUS FOR RAISING AND LEVELING FORMS FOR WALLS OF' CONCRETE STRUCTURES Filed Nov. 7, 1949 4 Sheets-Sheet 2 'WN f2? 773' 76 59 bra/0f? H Webb, am Z5 l 01//5 Jaffe/3m? B L/ l MUW-mp ORMS May 13, 1952 J. M. JACK ET AL APPARATUS FOR RAISING AND LEVELING F' FOR WALLS OF CONCRETE STRUCTURES 4 Sheets-Sheet 5 Filed Nov. 7, 1949 3 nventor:

B 'y v. l (Ittornegs w -H Imlw/ May 13, 1952 J. M. JACK ET AL 2,596,854

- APRATUS FOR RAISING AND LEVELING FORMS RoR WALLS oF CONCRETE STRUCTURES Filed Nov. 7, 1949 4 Sheets-Shea?l 4 Patented May 13, 1952 yAP-PARaAl?US ROR RAISING f: -AN D :LEYELING Y :OFfCONCRETEQSER/UC- landfautomatifeally maintaining the fform'in'llevel Kansas-CityMomass ignors :to DnublellrManu- 'facturingfGompany wlnc., Kansas City, Kans., alcol-poration of] Kansas (Claw-131) l 2 'standing fthe '-forces rapplie'cl thereto by the fjack jaws; to Aprovide 1a pair of fjaws :and :operating fmerribersinfeaeh '-'ijakif'oreffecting yraising-:action by'one 'j aw `fandith'en'fanother, one 4or *theiotherlof @said jaws :always lFhaving :engagement `with the I'rools Land i"an :overlap "lin the vjavv engaging `cycle ydu1ing vvhich both jaws -are engaged lwith Ithe rod `whereby fthe :raising :action fis :substantially 1 continuous "during the cycle'withfnofpossibleslip built wherein forms 'defining the #space `for ithe concrete of the f4vvallsvvere =shorter thanithefnal height VA'o'f lsaid LWalls '-arfd tsaid fformslfra'ised Fby 'meanso'f -'a plurality e df screw "jacks 'or lthe li-1re, the Y'actual raising operation was effected 'fbymne or `'more men Leach operating a @series of ja'eks, ands allendeavoring to lraisethe forms=simltane "ously. In `such `"operations the fconcre'te 'fat 'fthe lower part of the form?-musthaveCsetito'the-rpoint fand-gearlreducer drivefforf theijacks to slowlyf'raise *the formsrwh'erebyfthereiisfslibstantially continu- 4"ous im'ovem'ent `-of fthe iforms: duringifpouring Aand f'construction of the -Walls :an'dfno stickingo'f fthe is v*positive in -'operation, Y"of asimple, sturdy -con-- struction, and `capable `Aof `'operating -under =ad #versefconiiitions l'In v'accomplishing fthese vanid other fobjects of -th'atfthe 'form-ean`-be-move"d. 'Th'e-forms-mustf'be '520 *the presentA invention; we have vprovidedvimproved moved some, at frequent intervals, to-preventfthe -con'crete 'from' sticking 'ltofthe vforms. "'The'forms must `Anot be lowered "from 'a 'position even ffor :la

very ysmall yamount c'a-s'suh movement l' of the forms will cause limperfections f" the Mnwall sur- "'fa'c'es. Obviously -manual operation -`o`f 'a lar-'ge 4vnurrilter of screw jacks 1to1'raise fall =pfortions-Ik of fa large lform *requires the 'service's fof 'oneffor more unen "to ea-ch 'series f of 1jac'zksea'nri Ieven'thenit is practically impossible 1to* obtain uniform frais ing of the form. Alsowith'ithefscrew jacksffor raising the Afforrns "an Iexcessive lnuniher df -fmen *would have'to Ibe employedfonthestruture.

Thefobjects f of the 1present invention are 'to fprovi'de an 'eiiicient veconomical apparatus @fori l"progressively raising :a liorm fduing fconstrution' "of Concrete `vWalls Vwithout y=stopping pouring fof concrete 'orfother work A:to i provide f'for uniformly raisingf'a "form on la `concrete fbuildingstrueture 'Sco'niiitionV under ivarying zweight conditions vtto vidually driven and collectively controlled for raisingsaliorrn on a concretezstrncture; 'itoflprOf `:operatedfdevice'onfeachfjackfantlresponsive;to a

dimensions 'L are Lnniicmn throughout the length f tof L -tlie zrcfdsjeard vioirt fleeing capable fof "details offstructure, l`the prferred'f'forms of :which 4are Fillustra'ted in the accompanying "drawings,

"wherein: Y

1l isia perspective -'vievv-v of; a-'concrete 'struc- 25 'tureunder construction' withea'fplurality-'of jacks *for supporting yand A'raising a I'form fon 'Y the structure asthe'walls arefbeingpoured,

LFigjz r4isA afperspective" view-'of oneof ythe 'jacks "and "a portion of theiform suspended' therefrom. 30 Fig.V isra Atransverse `sectional view through 'othe'wallform'the -jaokbeingshown in-sideselevation.

vFig. 14 is t a longitudinal*sectional l`vievv through "the j'ack: illustrating :the `position Yof the j aws in 435 `'one extremity :dftiramovement"of'thevoperating levert "Fig v5 isa "detail'sectional viewithrough Aa' porv"tion 'of `the mjar/:kr illustrating the 'position of "the jaws when the/crank isgmove'ol" 90 V4from` the `posi- VFig. 6A is LA-a )sectional .view "through 'a portion of the jack, "similar to 5,"`sh'owingithefpo "sition of "thej avvs'vczhen` theA 'crankis moved '180 from the positionfshown 4in Fig. 4.

wideforzsusnending `theconcrete 1:lo'rmzfrom y:the 45 Fig. "7 'is fa jperspective -vew of the "jack "op- 'feratlng .members Fig. 8is;;a"vertical "sectionalvievv' throughthe `jack L 'gliide sleeve `:with the :rod extending therethrough l 50 Fig. v9 'isla 'sectional '.vi'eW `through a Vjoint ".of the .'rod showing Athe stud rconnector .therefor. `1Eig. L10 4is .a diagrammatic ,view o'f the `jack cotroLmehanism j Referringlmorein detailito the drawings-z l 51"A Il'ii'esignates f-a :concrete sstructure amen-asa a grain elevator in the process of construction. The walls 2 of the structure are formed by pouring concrete and the like between inside and outside wall forms 3 and 4 respectively, the inner surfaces of said walls being spaced'as at 5 in accordance with the thickness of the wall desired. The height ofthe forms 3 and 4 is less than the final height of the walls 2 to be built and is preferably approximately the height of the concrete in the wall that will be poured in a four to eight hour period, whereby the form may be raised and the portion of the wall uncovered at the bottom of the forms by the raising will have set four to eight hours. The time required for raising the form a distance corresponding to the height thereof should be varied according to the setting time of the concrete mix used.

The outer forms 4 preferably consist of a vertical wall v6 which extends continuously around the outer surface or perimeter of the walls of the structure to be built. The walls 6 may be formed of wood or other suitable material and secured to the outer surface thereof and substantially coextensive therewith are rib structures 1 and 8 to reinforce said wall 6. The inside form 3 also consists of a vertical wall 9 extending continuously around the inner surface of the wall structure to be built. Where the structure is an elevator or otherwise has ay plurality of compartments, the inner forms extend around the inner surface of each of the compartments. The inner form also has spaced ribs I and II secured thereto to reinforce the wall 9, said ribs I0 and II preferably being on the same planes as the ribs 1 and 8 respectively.

Supported on the upper ribs I0 and extending across the inside areas of the building to be constructed are joists I2 which support decking I3, the outer edge I4 of which substantially conforms to the shape and size of the innersurface of the wall to be constructed. Where there are inner chambers not defined by outsidey walls the forms for the inner chamber are connected to the forms of adjacent chambers by tie members I5 to aid in supporting and maintaining all of the forms of the same level. Both the forms 3 and 4 have suitable reinforcing members or braces I6 extending between the upper and lower ribs and also have vertical studs or spreaders I1 for distributing the stress on the forms.

The forms shown and described are particularly adapted for the building of elevators and the like, but may be varied as desired to meet the requirements of the particular structures to be built, providing the forms are such that they may be raised during the pouring of the concrete walls and that there be decking for movement of workers and material adjacent the top of the forms for facilitating the pouring of concrete and the handling of the equipment.

The forms 3 and 4 and the decking thereon are raised by a plurality of jacks IV which have operating mechanism engaging columns or rods I9 for effecting movement upwardly thereon. The rods I9 are preferably cylindrical and are arranged substantially centrally between the faces of the forms 3 and 4 whereby the rods extend vertically through the concrete wall being poured, said rods being spaced around the wall at suitable intervals to provide for sufficient jacks to raise and support all portions of the forms. Additional reinforcing ,rods (not shown) Vmay be arranged as desired in theconcrete walls to provide adequate strength thereto.

, said stud and smooth cylindrical portions 22 extending from the threaded area. Each of the rod ends is provided with sockets 23 for closely engaging the cylindrical portions 22 of the stud,

said sockets having threaded portions 24 for threadedly engaging the threaded portion 2I of the studs. Said studs are preferably formed of relatively high tensile steel whereby when applied to the rod ends as shown in Fig. 9 the joint has greater compression and shear strength than the remainder of the rods.

Arranged at each vertical rod I9 extending upwardly between the forms 3 and 4 is a yoke 25 consisting of vertically spaced horizontal members 26 and 21 which extend across the forms 3 and 4, the lower horizontal member 26 preferably resting on the upper edge of the outer wall 6. The ends of the horizontal members 26 and 21 preferably extend between spaced vertical members 28 and 29 and are secured thereto by suitable fastening devices 30 whereby the vertical members extend from the top horizontal member 21 downwardly alongside the forms 3 and 4, and are slightly spaced from the edges of the ribs 1, 8, I0 and II whereby suitable wedges 3l may be placed between the ribs and the vertical members from the yoke 25. The inner vertical members also are preferably secured to the joists I2 by means of fastening devices 32.

The lower horizontal member 26 is preferably provided with a central bore 33 adapted to slidably engage the respective rod I9 to form a guide. The upper horizontal member 21 is preferably formed of two members having spaced central portions whereby the rod I9 may extend therebetween and upwardly through a suitable bore in a cap member 34 mounted on said horizontal member 21 and the upper ends of the vertical members 28 and 29.

The forms 3 and 4 are suspended from the upper portion of the yoke by means of rods 35 and 36 which extend between the spaced upper members 21 through apertures 31 in the'lower horizontalimember 26, aperture 38 in the upper ribs 1 and I6, apertures 39 in the lower ribs 8 and II and terminate in threaded ends 40 for threadedly receiving nuts 4I. Relatively large washers 42 are preferably arranged between the nuts 4I and the lower rib members 8 and II and the nuts threaded to eifect engagement with said ribs.

A jack base member 43 is preferably arranged on the upper portion of the yoke whereby the jack is centered relative to the rod I9 and apertures arranged in the base whereby the rods the tension of the rods 35' and 36 to the upper ribs 1 and I6 on the forms 3 and Each of the jacks la is substantially icienifwall ften'd. Secured to fthe 4loase iis :a ;LA lower block 46 :having .an :aperture 41 adapted .to zslidably enfgage therrod I 9 :tto: form fa'. lower` guide. Mounted -:onfand:'extendinginwardly rfromrthe lower block 46-ionropposite:sideszof therrod :I 9 Lare;-side,plates e418 :and 49rconnected-at1ther .upperends by t-a '-top block 150. 'Intermediatefthe ,top 'and :lower blocksis arcenter gudeblock 5I. Secured in openings .552: and 5,3 in Ythe top and centerblocks lrespectively, is.;a" sleeve-54 having .abore 55 which "ls :adapted to fslidably engage "the -rod I9 to form a guide therefor. Extending-:betweenf'the :guide "sleeve andthe :side -blocks---are fspaced end xmembersioffanioperating lever 56', said. ends '2beingfpivotallymountedfont trunnions 51- secured fztosand .extending ,inwardly from the side i plates iintermediate A:the toprand center blocks -whereby :.saidlevermayibe rocked about .ahorizontal axis extending ith-rough the trunnions a and vsubstanstiallyithrough thevertical center of the .rod/I9, ithe. lever havinganrarm :58 preferably extending overzthezbase.member;and terminating'infan end apivotallyconnected at 6D to one end ofa conmecting rod IBI, ithe 4opposite end tof @saidfcon- -tnecting rnd-:being pivotally connected 1 as at ,62 sito :a :crank .63 mounted on a shaft .W64 extending from a gear speed reduction unit6-5 suitably i-mounted :onza :bracket 66 c carried by the base 43 1in spacedrrelation to/the rod' I9.

,.fPower is fsupplied for operating the jackzby aneans offa suitable. motor -6-1 'drivinglyconnected ftorthaspeedgtreducer unit 65andzcperatingffrom rass-uitable;A- source of :electric ,current :as later .deascribed, .saidzmotor andgearrreduction unitpref- .era-bly being fsuch as pto rdrive theshaft --54 zat a -..ve1:y .slow speed, in :actual practice it has been ffoundzsdesirabler-that the 'shaft-rotate .at arspeed rvoff-one revolution in:fo,ur to rsixminutes.

.Arranged :between the lower block 45 and ,the -center :block :5 I fare verticallyfspaced `upper :and lower .jaws ordogs 6.8; and69 '.havingzfovaleshape-d .-.apertures '69 sleeved over ithe Akrod ...I 9. ,s-A'dj a'cent the end :of the jaw 68,:on 'the lmotor side :of :the :roti '.I9,iis 1a' transverse'groove -:1; ntoV seat the end Jo'farpushf. armi-16 ,fthe opposite end of.whichseats =in ai transversergroove'1 I yof ag'block 1I extending between'l the spaced s end members i155.. of .the lever 56 In order toresiliently. urge ithe ends of :the push -arm lin -the respective seats, fsaid :ends l.' are jpivotallyf connectedltoblts 12 v:and 1:3 which extend through fapertures 'r14 v:and' 'I5 in I the jaw 1 65 vbein-g fthreafded-'to reeeive `Vnutsl 16v/ith compression springs i111 donated between the :nuts -=and "thefjaw a-n'd block. 'The `endof the -ja-w'58on A`the'oppositeside of xthe red vI9 to the push arm `is suitably Iconnected `to 'tensionsprings '18, `the otherf'ends 'ofsaidsprings beingcsuitably con- 18 urges "the hend lof the gjaw fupwardly, pivoting said fija-w @onf-the lower end -of 1vthe pus-h arm v`69 =Whereby`theredges ofthe oval aperture finfsaid :blockltresilientlyurge'thefend:ofzthepushfearm intoitherseationthe block'g. rl'Ihe oppositeven'd 5 of the puslnarm 1,82 seatsina Y transversegigroove 381;in;one;endf;ofthe jaw 65, said;.end.;o,f the-.push vvarmheing .zpivotally rconnected to..r afboltf which fextendszthrough :ansa-perture-.BS in :,thegjaw, 1 the :endLofesaidl:boltbeing threaded toreceive aznut -.90.and: at-spring: 9 I )beingzinterposed between the l nut;v and thefjaw @wherebyisaidspringsresiliently V..urges the :end `L ofithe v. push ;arm: into" seatingten- `gagement withthejaw. .Theendmthefjaw `66 ,zontthe .opposites side .of;.the1ro,d I 9, isgsuitablyconfnectedtotthe.` ends ofitensiornspringsfZ .fthelother f ends of .saidzspringsbeing, connected :astl ataf93 ito fthe side: plates llI8 :and 249 :wherebyy thetensioxr` 'of the springs .urges .the-end of -ithe` jaw '.iupwardly, pivoting same. on thellower :enid-:ofA ,theapush :arm E82 wherebysthefedgesmfrthe oval. y.apertureziilfzof saidiawengages therod |59. `The sizeof :theoval 'apertures361 relativeito atherod I9, :the length of r the: push: :arm 10 and 82, .andi-the spacing t' of` .the seats for the-f ends fof: said 4arms Sfromithezrod :I9 are such-that whenzthelever 56^ is1positionedzas `shown in Fig. i4, .the edges of "the apertures f69 .ofboth .jay/stare lengaged iwi-th rvthe'rrnrls f I9,1the 'jawrIS having vjusttaken.affirm bitefon-.therod andthe ljaw `Iibeing ready'ito freleasefthebitefon vthe frod. :Further .-rotation. of :ithe E'crank i'by .-thefmotor 161 in elect rmlyrholds inthe fjaw '68 =in engagement .with the rod whereby the push arm i113 :seated in ithe f groove :o'f said j` jaw l:'iful- -crums fthereon and the @lever 2.56' fulcrums :on `the upper end of said push .armran'd1downward :movement of the `l lever -56' Vraisestlfle trunnions T51, si'de plates l48 A'-anclll!! 1and`^base 43 upwardly lArelative 'to the ro'd I9. ".f'lhisfraising-fmovement lalso Ylifts `the yokeiZ-' and itheforms3.--andrf4,"lthe I'jaw 169 'slidingupWaTdIyfQnthe Jrod l' I 9. `After-*90" offrotationof'thecrank, as shown in'FigfJ-the `jawiiis stillfengagedby the rod andthe jaw 69 sliding-upwardlyfthereon. flAfter the crank farm fha-s =moved approximately 170 from `^'thefpos`ition :shown in' Figxl, thefjaw Qf'begins'tobite into'the rod I9. On 1180" movementfof thefcrank rfrom the position shown in -1Fig.-4,= asl-shown -in"Fig.fr 6. the jaw 69 has taken a'bitefinto-'ftherrod-fI9and --the jawj'68 isbeginningtofstart torlease said Y"rodi both of 'sai'd jaws being-engaged' at the par- Iticular 'position shown l in Fi g. -f 6. Upon 21approximately ten -more degrees :of movement of the prank, 'the jaw "68 -Willere1ease fthe erod and uthe upwardmovement-ofthe lever'56 lineiectfulerurns=said lever on the'uppereendcf-the push arm 592 which in turn -`fulcrums son the jaw 69. which isffirmly-engagedfwithftherod 1 I 9; whereby Lthe =trunnionsf aremoved upwardly Prelative tothe rod, lifting the Jyoke `*and forms. This overlapping of the engagement ^of the jawsprevents yany -downward yslipping of the 'jacks and geffects substantially 4continuous upward "movement Aof 'f the :"forms, the Atension and Fcompression lsprings allowing thefapparatus` to give-andprevent"bindthereof during *the time bothfjawsareeeng9fgd'andaidingin -releasing 'said jaws whenthe pressurerfrom the lever 556 ispremoved romtt'he --irespective push arms engagingsame `Each of fthe jaicks is provided Vwith 4a control "box 94 containing suitable electric :apparatus 'or Ycontrolling the operation ofthe motor'l. The cont-rol boX94is adjustably mountedfor vertical 'adjustment Yon ka support :'95 kcarried by fthe base .14;3. Itis desirable tolit '.all tof "theorm cr the 'sent-re estructura fat 'the fsame *time :and also {tt :A ep the form "level "Thereforefdxed in""the' lower portion of the control box, and depending therefrom, is a tubular float chamber 99, the lower end of said chamber being connected to a Y-tting 91, whereby hose members 98 and 90 may be connected to the Y-tting to eiect a series connection of all of the oat chambers for the jacks, whereby the level of liquid in said float chambers will vary with the level of liquid in a liquid control receptacle |0l. In order to support the liquid control receptacle |0| independently of movement of the forms and jacks, a column or rod |02, which is similar to the rods |9, is arranged in and extends upwardly from the concrete wall and the receptacle provided with a sleeve |03 on the side wall thereof, said sleeve being slidably mounted on the rod |02, a suitable fastening device |04 being provided for securing the receptacle to the rod |02. With this arrangement, the fastening device is released and the receptacle |0| raised as desired whereby the liquid will flow through the hose connections 98 to the next Y-fitting 91, raising the level of liquid in the respective oat chamber 96 and also flow through the hose 99 to the next adjacent float chamber 96 to raise the level of liquid therein. The upper end of the float chamber is preferably provided with a closure having an aperture through which a rod |06 extends whereby the closure serves as a guide to center a float |01 in the fioat chamber for movement vertically therein in response to change in level of the liquid. The rod |06 is threaded and provided with spaced nuts |01 and |08 forming stops adapted to engage an arm |09 extending outwardly from a frame |10 pivotally mountedin the switch box as at and having clips ||2 for mounting a mercury switch |3 whereby upward movement of the float engages the stop |08 with the arm |09 to tilt the mercury switch whereby the mercury closes contacts ||4 and ||5 to close the circuit between lines ||6 and ||1, the line ||1 leading through a capacitor ||8 to the motor 61. The line ||6 is provided with a fuse ||9 and is connected to a line leading to a source of electric current. The ground from the motor is connected by a line |2| to a line |22 which is the return line to the source of electric current.

Connected to the line ||1 and line |21, and parallel with the motor 61, is a light |23 which is visible through an aperture |24 or a transparent member in the control box to indicate when the motor is operating. When the motor is operating the jack to effect raising of the forms, the liquid level recedes in the float chamber 96 until the stop ||1 engages the arm |09 to tilt the mercuryv switch to move the mercury away from the contacts i4 and I5 to break the circuit to the motor and stop operation of the jack.

In operating an apparatus constructed as described in the construction of a concrete building a suitable base for the building structure is arranged and the rst sections of the rods I9 imbedded in said base to extend vertically therefrom centrally of the walls to be poured. The forms 3 and 4 are then arranged to define the space for the lower portion of the walls with the joist I2 and decking 3 arranged as illustrated. The yokes 25 are then placed on the form and the jacks on the yokes with the jaws 68 and 69 engaged with the respective rods I9. The wedges 3| are then applied to plumb the yoke whereby the upward pull of the jacks on the rods |9 will move the forms vertically. The receptacle |0| y is securedto the rod |02whereby-the-level of liquid. .therein -is such that.l the level of liqw` uid in each of the float chambers 96 is adjacent to the floats |01. Each of the control boxes 94 is then adjusted on the supports 95 whereby any change in the level of the liquid in the receptacle |0| or movement of said receptacle eifects operation of the mercury switch ||3. This adjustment may be made before the original pouring of the lower portion of the wall of the structure or may be done simultaneously therewith. Concrete is then poured between the forms 3 and 4 until the height of the forms is substantially filled with concrete, this pouring operation continuing around the entire wall of the structure at such a rate that four to eight hours elapse from the time the pouring is started until the forms are substantially filled.

After the forms are substantially iilled with concrete the receptacle |0| is raised on the rod |02, whereby the level of liquid in the oat chambers 96 is raised, moving the floats |01 of the respective jacks upwardly to eflectl operation of the respective switches ||3 and energization of the motors of the jacks to rotate the crankshafts 64 to oscillate the levers 56 and operate the jaws 68 and 69 to effect upward movement of the jacks on the rods I9, the jacks continuing in operation until the level of liquid in the float chambers 96 recedes therein and the floats lower to tilt the switches ||3 to interrupt the electrical circuit to the motor 61 and stop operation of the `lacks.

It is preferable that the receptacle |0| be raised on the rod |02 for a distance of approximately one inch or more and then when the jacks cease operation to again lift the receptacle whereby the forms are moved upwardly at least once in each ten minute period to prevent sticking of the concrete to the forms. This is true even though no concrete might be poured during that period, however, except under such circumstances the receptacle may be raised to eiect operation of the jacks as desired to raise the forms according to the concrete that is poured. In actual operation when the receptacle is raised on the rod |02 the liquid flows through the hose 98 to the rst oat chamber 9S starting operation of the respective jack, and then flows to the next oat receptacle to start the operation of that jack and so on around the entire structure. The time elapsing between the starting of the first jack and the last J'ack on the structure is very short so as not to materially affect the level of the forms 3 and 4, but this arrangement does have a material advantage in that the motors 61 are started individually whereby the starting load on the source of electric current is reduced since at no time will all of the motors start simultaneously. Also if there is any variation in the lift eected by the respective jacks in one revolution of the crankshafts 64, the jack having the lesser lift will merely operate slightly longer than the otherjacks to bring the forms into level condition, but by raising the rej ceptacle |0| short distances each time there will be no perceptible out-of-level condition in the tially continuous lift for forms suspended therefrom with accurate control of the liftingof the forms to maintain same level and eliminate 'l sticking of the concrete to the forms whereby a acaesa l building?. havingfrelativelyy high.: uniform; walls beepouredr.eiiieiently.'k and: continually: until completedi..

What ywetclaim .and:desiretousecure -bygLetters Raierl'tf. .il

l. l.,In lazjaclz:for. progressively raising concrete forms.; during.; pouring` and; setting, of concrete tliereim. ai:L frame adapted; to` be;` secured. tothe wallsg o their forni;y az column supported'- in4 the concrete-im said. form and extendingf upwardly throughstlreupper:portion ofl the..frame, a lever extendingjrearwardly'from thecolumn and` havingf;spacedrarmssstraddling said. column, `means nivotailly mountingigthe arms -on the frameadj acentfnthefz upper: portion thereof` forJ oscillation ahout'horizontal: axis extending'. substantially through thefvertical.center1 of. the.- column, ,vertically; spaced; upper; and lowerf. jaws i sleeved on ther;4 column.: VbelowL the;m lever armsf and l adapted torgrirrsaidzcolumn.-inzresponsefito. tiltingA of .said jawsj-aapushlrarmfspacedsrearwardly of the.- column and having ends seating on the-leverv and upper jaw. a push arm spaced forwardly of the column and; having ends; seating on the lever and lower-:i awpmeansresifliently urging the push arnraendsintoseatinggengagement with the lever and jaws, springs having ends connected to the frame and other-ends `connectedto the forward end of the upper j aw and rearward end of the lower' 'j aw for resiliently urging the"for.ward 'end of the upper jaw and rearwar'clend'of'thelwer jaw upwardlyto (tilt saidijawsiaboutzthe ends of the respective push arms engaged therewithand intotilted.-engagement with .thecOlumm-acrank, ajmotorandspeed reducer connected thereto ,for rotating thecrank, and meansconnectingf, the crank cwiththe lever remotely.y from thecoliimn whereby rotation of the crankslowly oscillates the'elevenand effects further tilting of -the jaws and intermittentgripping Vof Vthe column thereby for slowly and-substantiallycontinuously moving the frame vertically relativen-to the column'y during'theA cyclev of oscillation; ofthe leverg'. said lever, push arms and means resiliently urging the jaws into tilted engagement with the column cooperating to effect related gripping engagement of the column by the jaws and maintain at least one jaw in gripping engagement with the column at all times to act as a fulcrum for the lever, said fulcrum being in a vertical plane spaced from the pivotal mounting of the lever on the frame whereby oscillatory movement of the lever eifects vertical movement of the frame.

2. In a jack for progressively raising concrete forms during pouring and setting of concrete therein, a frame adapted to be secured to the walls of the form, a rod supported in the concrete in said form and extending upwardly through the upper portion of the frame, a tubular guide mounted in the upper portion of the frame and adapted to sleeve over the rod, a lever extending rearwardly from the guide tube and having spaced arms straddling same, means pivotally.v mounting the arms of the lever adjacent the upper portion of the frame for oscillation of the lever about a horizontal axis extending substantially through the vertical center of the rod, vertically spaced upper and lower jaws having oval apertures sleeved on the rod below the lever arms and adapted to grip said rod in response to tilting of said jaws, a push arm spaced rearwardly from the rod and having ends seating on the lever and upper jaw, a push arm spaced forwardly of the rod and having ends seating on the lever and lower jaw, means resiliently urging lil)I theepushfarm ends into seatingl engagementfwith the lever and jaws, the lever'` engaging portions of? theipush arms havinggreater spacingjfrom thecrodethan the vjaw.- engaging portions,- springs having' endse connected to,` the: frame andr other endsxsconnected to. thefforward end of' the' upper jaw'fand; rearward: endioff` the lower jaw for resiliently,l urging the forward.` end ofthe upper jawfand rearward .endrofthe lowerjaw upwardly t-tilt'said:` jaws about ,theends of the respective pushsarmsengaged therewith and 'into tilted engagementwith the --rodgpa crank, a motor and speedreducerconnected thereto for rotating the oran-k, 4and:means-connecting the lcrank with the leveriremotelyof the rod. whereby rotation of the crankslowlyoscillates the lever` and effects tilting otrthe v-jawsrand:intermittent gripping of the rod thereby; forzslowly and Vsubstantiallyy continuously movinggthef: frame fvertically relative to therod duringgthe.cyclez-ofl oscillation ofthe lever, the spacing of'the'-p, ush, armsfrom the rod and the sizei ofethegovalapertures inthe jaws relative to the-,rod effecting` a* simultaneous grippingof the rod ibygboth'jaws during two intervals of each rotation of; the;crank to eliminate any downward movement; ofthe `frame and form relative to the rod, saidfleverp usharms and means resiliently urging.: the-.yjawsginto tilted. engagement with the rod? cooperating. to maintainat -least one of the jawsrngrippjngengagement lwith the rod atv all times-tosact as afulcrumfor. the lever, said fulcru-m'xbeing-in arvertical plane spaced from the pivotalV mounting ofthe lever 0n the frame whereby-t oscillation of the. lever eiects vertical movement-.ofthe frame. and form. y

3. In rcombination, a concrete form, a plurality ofzframesspaced-alongftheform and adapted to: besecuredtofthe walls of Ythe form, a plurality offspacedcolumnslsupportedin the concrete in said.' formt andI extending upwardly therefrom, each of said: frames having one of said columns extendinglthrough theiupper portion thereof, a jaclQon-each-.of the frames, said jacks each having a pair of jaws sleeved on the column and adapted to grip said column in response to tilting of said jaws, operating mechanism on each of the frames for tilting the jaws of the respective jacks and maintain at least one jaw on each jack in gripping engagement with the respective column at all times to effect slow substantially continuous upward movement of the respective frames relative to the column, a liquid receptacle mounted on a column and adapted for independent vertical movement relative thereto, a float actuated control on each frame for controlling operation of the respective jack operating mechanisms, and a liquid supply pipe common to all of said float actuated controls and communieating with the liquid receptacle for flow of liquid to said float actuated controls, all of said float actuated controls being level whereby raising of the liquid receptacle raises the liquid level in each of said float actuated controls eiecting simultaneous operation of the respective jack operating mechanisms for substantial equal vertical movement of all of the frames and form portions relative to the columns, said float actuated controls stoppingoperation of the jack operating mechanisms when the vertical movement of the respective frame corresponds to the amount the liquid receptacle was raised, each of said controls operating independently of the others whereby the respective jack operating mechanism stops only when that portion of the form is level regardless of the respective speed of vertical movement thereof relative to the other frames and portions of the form.

4. In combination, a concrete form, a plurality of frames spaced along the form and adapted to be secured to the walls of the form, a plurality of spaced columns supported in the concrete in said forms and extending upwardly therefrom, each of said frames having one of said columns extending lthrough the upper portion thereof, levers pivotally mounted on each of the frames adjacent the upper portion thereof for oscillation about the horizontal axes extending substantially through the vertical center of the respective columns, said levers extending rearwardly from the respective columns, vertically spaced upper and lower jaws sleeved on the respective columns below the respective lever arms and adapted to grip said columns in response to tilting of the jaws, push arms spaced rearwardly from the respective columns and having ends seating on the lever and one of the respective jaws, push arms spaced forwardly of the respective columns and having ends seating on the respective levers and other jaws, means resiliently urging the push arm ends into seating engagement with the lever and jaws, means on the frames for resiliently urging the jaws upwardly to tilt same about the ends of the respective push arms engaged therewith and into tilted engagement with the respective column. a motor and speed reducer adjacent each of the frames, cranks driven by said speed reducer, means connecting the respective cranks with the respective levers remotely of the respective columns whereby rotation of the cranks oscillates the levers and effects further tilting of the jaws and intermittent gripping of the columns thereby for slowly and substantially continuously moving the frames vertically relative to the columns during the cycle of oscillation of the levers, a liquid receptacle on one of the columns and adapted for independent vertical movement thereon, float chambers on each of the frames, means connecting the liquid receptaclevwith each of the float chambers for flow of liquid thereto, a switch for each of the motors for controlling supply of electric current thereto for operating said motors, floats in the respective float chambers and responsive to the level of the liquid therein for actuating the respective switches, and means for adjustably mounting the float chambers on the respective frames whereby all ofthe floats are on the same level and raising of the liquid receptacle will raise thelevel of' liquid in the float chamber to operate the respective switches to energize the motors for simultaneous movement of the frames vertically relative to the columns, the Vertical movement of the frames causing a receding of the vlevel of liquid in the respective float chambers whereby the respective switches are independently actuated to stop the respective motors and the vertical movement of the frames when said vertical movement of each of said frames corresponds to the amount the liquid receptacle was raised.

JOHN M. JACK. GORDON H. WEBB. LOUIS H. JEFFERSON;

REFERENCES CITED The following references are of record in the le of this patent: y

UNITED STATES PATENTS Number Name Date 752,502 Yeager Feb. 16, 1904 824,614 Beaver June 26, 1906 841,904 Spelman Jan. 22, 1907 1,115,027 Seabury Oct. 27, 1914 1,730,727 Gurley Oct. 8, 1929 2,016,575 Nemec et a1. Oct. 8, 1935 FOREIGN PATENTS Number l Country Date 3,285 Great Britain 1867 

